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20 results on '"Bouneau S"'

1. Ion-pair dissociation of highly excited carbon clusters: Size and charge effects

Author

Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, Géraldine, Loreau, Jérôme, Mahajan, Thejus T. M, Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, Géraldine, Loreau, Jérôme, and Mahajan, Thejus T. M

Abstract

We present measurements of ion-pair dissociation (IPD) of highly excited neutral and ionized carbon clusters Cn=2-5(q=0-3)+. The tool for producing these species was a high-velocity collision between Cn+ projectiles (v=2.25 a.u.) and helium atoms. The setup allowed us to detect in coincidence anionic and cationic fragments, event by event, leading to a direct and unambiguous identification of the IPD process. Compared with dissociation without anion emission, we found typical 10-4 IPD rates, not depending much on the size and charge of the (n,q) species. Exceptions were observed for C2+ and, to a lesser extent, C43+ whose IPDs were notably lower. We tentatively interpret IPDs of C2+ and C3+ by using a statistical approach based on the counting of final states allowed by energetic criteria. The model is able to furnish the right order of magnitude for the experimental IPD rates and to provide a qualitative explanation of the lower IPD rate observed in C2+., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2017

2. Ion pair dissociation of highly excited carbon clusters

Author

General Assembly of the Belgian Physical Society (20/04/2016: Gent), Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, Mahajan, Thejus T. M, General Assembly of the Belgian Physical Society (20/04/2016: Gent), Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, and Mahajan, Thejus T. M

Abstract

info:eu-repo/semantics/nonPublished

Published
2016

3. Ion pair dissociation of highly excited carbon clusters

Author

Journée Rencontre des Jeunes Chimistes de la SRC (26-04-2016: Brussels), Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, Mahajan, Thejus T. M, Journée Rencontre des Jeunes Chimistes de la SRC (26-04-2016: Brussels), Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, and Mahajan, Thejus T. M

Abstract

info:eu-repo/semantics/nonPublished

Published
2016

4. Ion pair dissociation of highly excited carbon clusters and carbon-based molecules

Author

XLIC COST Meeting: XUV/X-ray light and fast ions for ultrafast chemistry (2016-04: Stockholm), Béroff, Karine, Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, Mahajan, Thejus T. M, XLIC COST Meeting: XUV/X-ray light and fast ions for ultrafast chemistry (2016-04: Stockholm), Béroff, Karine, Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, and Mahajan, Thejus T. M

Abstract

info:eu-repo/semantics/nonPublished

Published
2016

5. Ion pair dissociation of highly excited carbon clusters

Author

International Meeting on Atomic and Molecular Physics and Chemistry (2016-06-27: Havre), Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, Mahajan, Thejus T. M, International Meeting on Atomic and Molecular Physics and Chemistry (2016-06-27: Havre), Launoy, Thibaut, Béroff, Karine, Chabot, Marin, Martinet, Guillaume, Le Padellec, A., Pino, Thomas, Bouneau, S., Vaeck, Nathalie, Liévin, Jacques, Féraud, G., Loreau, Jérôme, and Mahajan, Thejus T. M

Abstract

info:eu-repo/semantics/nonPublished

Published
2016

6. Ion-pair dissociation of highly excited carbon clusters, size and charge effects

Author

Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Pino, Thomas, Le Padellec, A., Bouneau, S., Féraud, G., Do Thi, N., Vaeck, Nathalie, Liévin, Jacques, Loreau, Jérôme, Béroff, Karine, Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Pino, Thomas, Le Padellec, A., Bouneau, S., Féraud, G., Do Thi, N., Vaeck, Nathalie, Liévin, Jacques, Loreau, Jérôme, and Béroff, Karine

Abstract

info:eu-repo/semantics/published

Published
2015

7. Ion-pair dissociation of highly excited carbon clusters, size and charge effects

Author

Molecular Physics Workshop (05-10 July, 2015: Caen, France), Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Pino, Thomas, Le Padellec, A., Bouneau, S., Féraud, G., Do Thi, N., Vaeck, Nathalie, Liévin, Jacques, Loreau, Jérôme, Béroff, Karine, Molecular Physics Workshop (05-10 July, 2015: Caen, France), Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Pino, Thomas, Le Padellec, A., Bouneau, S., Féraud, G., Do Thi, N., Vaeck, Nathalie, Liévin, Jacques, Loreau, Jérôme, and Béroff, Karine

Abstract

info:eu-repo/semantics/nonPublished

Published
2015

8. Ion-pair dissociation of highly excited carbon clusters, size and charge effects

Author

XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2015) (2015-07-22 /2015-07-28: Toledo), Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Pino, Thomas, Le Padellec, A., Bouneau, S., Féraud, G., Do Thi, N., Vaeck, Nathalie, Liévin, Jacques, Loreau, Jérôme, Béroff, Karine, XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2015) (2015-07-22 /2015-07-28: Toledo), Launoy, Thibaut, Chabot, Marin, Martinet, Guillaume, Pino, Thomas, Le Padellec, A., Bouneau, S., Féraud, G., Do Thi, N., Vaeck, Nathalie, Liévin, Jacques, Loreau, Jérôme, and Béroff, Karine

Abstract

info:eu-repo/semantics/nonPublished

Published
2015

9. Measurement of energy and angular distributions of secondary ions in the sputtering of gold by swift Au-n clusters: Study of emission mechanisms

Author

Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Shapiro, M. H., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Shapiro, M. H., and Tombrello, T. A.

Abstract

Energy and angular distributions of negative ions (Au–, Au2-, Au3-, and Au5-) emitted from gold target bombarded by Au, Au4, and Au9 projectiles at 200 keV/atom were measured with a multipixel position sensitive detector. The angular distributions are symmetrical with respect to the normal to the target surface and forward peaked. They depend on the type of emitted ions, on the emission energy, and on the projectile size. More forward directed emission is observed with Au9 projectiles. The secondary ion energy distributions obtained with Au and Au4 projectiles are well reproduced by a sum of linear collision cascades and thermal spike processes. However, in the case of Au9 projectiles the energy distributions are better described by using a simple spike model with two different average temperature regimes: the first one corresponds to high emission energy occurring in the early stage of the whole process, and the second to the low energy component.

Published
2005

10. Measurement of energy and angular distributions of secondary ions in the sputtering of gold by swift Au-n clusters: Study of emission mechanisms

Author

Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Shapiro, M. H., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Shapiro, M. H., and Tombrello, T. A.

Abstract

Energy and angular distributions of negative ions (Au–, Au2-, Au3-, and Au5-) emitted from gold target bombarded by Au, Au4, and Au9 projectiles at 200 keV/atom were measured with a multipixel position sensitive detector. The angular distributions are symmetrical with respect to the normal to the target surface and forward peaked. They depend on the type of emitted ions, on the emission energy, and on the projectile size. More forward directed emission is observed with Au9 projectiles. The secondary ion energy distributions obtained with Au and Au4 projectiles are well reproduced by a sum of linear collision cascades and thermal spike processes. However, in the case of Au9 projectiles the energy distributions are better described by using a simple spike model with two different average temperature regimes: the first one corresponds to high emission energy occurring in the early stage of the whole process, and the second to the low energy component.

Published
2005

11. Measurement of energy and angular distributions of secondary ions in the sputtering of gold by swift Au-n clusters: Study of emission mechanisms

Author

Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Shapiro, M. H., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Shapiro, M. H., and Tombrello, T. A.

Abstract

Energy and angular distributions of negative ions (Au–, Au2-, Au3-, and Au5-) emitted from gold target bombarded by Au, Au4, and Au9 projectiles at 200 keV/atom were measured with a multipixel position sensitive detector. The angular distributions are symmetrical with respect to the normal to the target surface and forward peaked. They depend on the type of emitted ions, on the emission energy, and on the projectile size. More forward directed emission is observed with Au9 projectiles. The secondary ion energy distributions obtained with Au and Au4 projectiles are well reproduced by a sum of linear collision cascades and thermal spike processes. However, in the case of Au9 projectiles the energy distributions are better described by using a simple spike model with two different average temperature regimes: the first one corresponds to high emission energy occurring in the early stage of the whole process, and the second to the low energy component.

Published
2005

13. Simulation of MeV/atom cluster correlations in matter

Author

Hartman, J. W., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Hartman, J. W., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., and Pautrat, M.

Abstract

We present an efficient algorithm able to predict the trajectories of individual cluster constituents as they penetrate relatively thick amorphous targets. Our algorithm properly treats both the intracluster Coulomb repulsion and the collisions between cluster constituents and target atoms. We have compared our simulation predictions to experimental measurements of the distribution of lateral exit velocities, and demonstrated that the in-target Coulomb explosion of 2MeV/atom carbon clusters in carbon foils must be shielded with a screening length of less than 2.5 Å. We also present a simple phenomenological model for the suppression of the exit-side charge of ions in clusters which depends on the enhanced ionization potential that an electron near an ion feels due to the ion’s charged comoving neighbors. By using our simulation algorithm we have predicted the exit correlations of the cluster constituents and verified that the charge suppression model fits the observed charge suppression of ions in clusters to within the experimental uncertainties.

Published
2000

14. Simulation of MeV/atom cluster correlations in matter

Author

Hartman, J. W., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., Pautrat, M., Hartman, J. W., Tombrello, T. A., Bouneau, S., Della Negra, S., Jacquet, D., Le Beyec, Y., and Pautrat, M.

Abstract

We present an efficient algorithm able to predict the trajectories of individual cluster constituents as they penetrate relatively thick amorphous targets. Our algorithm properly treats both the intracluster Coulomb repulsion and the collisions between cluster constituents and target atoms. We have compared our simulation predictions to experimental measurements of the distribution of lateral exit velocities, and demonstrated that the in-target Coulomb explosion of 2MeV/atom carbon clusters in carbon foils must be shielded with a screening length of less than 2.5 Å. We also present a simple phenomenological model for the suppression of the exit-side charge of ions in clusters which depends on the enhanced ionization potential that an electron near an ion feels due to the ion’s charged comoving neighbors. By using our simulation algorithm we have predicted the exit correlations of the cluster constituents and verified that the charge suppression model fits the observed charge suppression of ions in clusters to within the experimental uncertainties.

Published
2000

15. Intrinsic proton states around the superdeformed shell closure Z=80

Author

Bouneau, S., Azaiez, Faiçal, Duprat, Josette, Deloncle, Isabelle, Porquet, M. G., Astier, Alain, Bergström, M., Bourgeois, Christian, Ducroux, L., Gall, B. J. P., Kaci, M., Le Coz, Y., Meyer, Matthias, Paul, E. S., Redon, N., Riley, M. A., Sergolle, H., Sharpey-Schafer, J. F., Timar, Janos, Wilson, A. N., Wyss, R., Heenen, Paul-Henri, Bouneau, S., Azaiez, Faiçal, Duprat, Josette, Deloncle, Isabelle, Porquet, M. G., Astier, Alain, Bergström, M., Bourgeois, Christian, Ducroux, L., Gall, B. J. P., Kaci, M., Le Coz, Y., Meyer, Matthias, Paul, E. S., Redon, N., Riley, M. A., Sergolle, H., Sharpey-Schafer, J. F., Timar, Janos, Wilson, A. N., Wyss, R., and Heenen, Paul-Henri

Abstract

info:eu-repo/semantics/published

Published
1998

16. Intrinsic proton states around the superdeformed shell closure Z=80

Author

Bouneau, S., Azaiez, Faiçal, Duprat, Josette, Deloncle, Isabelle, Porquet, M. G., Astier, Alain, Bergström, M., Bourgeois, Christian, Ducroux, L., Gall, B. J. P., Kaci, M., Le Coz, Y., Meyer, Matthias, Paul, E. S., Redon, N., Riley, M. A., Sergolle, H., Sharpey-Schafer, J. F., Timar, Janos, Wilson, A. N., Wyss, R., Heenen, Paul-Henri, Bouneau, S., Azaiez, Faiçal, Duprat, Josette, Deloncle, Isabelle, Porquet, M. G., Astier, Alain, Bergström, M., Bourgeois, Christian, Ducroux, L., Gall, B. J. P., Kaci, M., Le Coz, Y., Meyer, Matthias, Paul, E. S., Redon, N., Riley, M. A., Sergolle, H., Sharpey-Schafer, J. F., Timar, Janos, Wilson, A. N., Wyss, R., and Heenen, Paul-Henri

Abstract

info:eu-repo/semantics/published

Published
1998

17. Superdeformation in bismuth

Author

Clark, R M, Bouneau, S, Wilson, A N, Cederwall, Bo, Azaiez, F, Asztalos, S, Becker, J A, Bernstein, L, Brinkman, M J, Deleplanque, M A, Deloncle, I, Diamond, R M, Duprat, J, Fallon, P, Farris, L P, Henry, E A, Hughes, J R, Kelly, W H, Lee, I Y, Macchiavelli, A O, Porquet, M G, SharpeySchafer, J F, Stephens, F S, Stoyer, M A, Vo, D T, Clark, R M, Bouneau, S, Wilson, A N, Cederwall, Bo, Azaiez, F, Asztalos, S, Becker, J A, Bernstein, L, Brinkman, M J, Deleplanque, M A, Deloncle, I, Diamond, R M, Duprat, J, Fallon, P, Farris, L P, Henry, E A, Hughes, J R, Kelly, W H, Lee, I Y, Macchiavelli, A O, Porquet, M G, SharpeySchafer, J F, Stephens, F S, Stoyer, M A, and Vo, D T

Abstract

High angular momentum states in Bi-195-197 are populated in two reactions: W-183(F-19,xn)Bi-202-x and Ta-181(Ne-20,xn)Bi-201-x at beam energies of 108 and 123 MeV, respectively. Gamma rays were detected using the Gammasphere array. Three weakly populated rotational sequences have been found. They each have properties characteristic of other superdeformed bands in this mass region. On the basis of cross-bombardment information we believe that one band belongs to each of Bi-195, Bi-196, and Bi-197. The properties of the bands in the odd-Bi nuclei are best reproduced if the odd proton occupies the favored signature of the [651]1/2 orbital, while the band in Bi-196 has this same proton configuration coupled to an additional N=7 (j(15/2)) neutron. The relative behavior of the J((2)) moments of inertia can be qualitatively understood in terms of Pauli-blocking effects., NR 2015

Published
1996
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18. SUPERDEFORMATION IN THE BISMUTH NUCLEI

Author

CLARK, RM, BOUNEAU, S, AZAIEZ, F, ASZTALOS, S, BECKER, JA, Cederwall, Bo, DELEPLANQUE, MA, DIAMOND, RM, DUPRAT, J, FALLON, P, FARRIS, LP, HENRY, EA, HUGHES, JR, KELLY, WH, LEE, IY, MACCHIAVELLI, AO, PORQUET, MG, SHARPEYSCHAFER, JF, STEPHENS, FS, STOYER, MA, VO, DT, WILSON, AN, CLARK, RM, BOUNEAU, S, AZAIEZ, F, ASZTALOS, S, BECKER, JA, Cederwall, Bo, DELEPLANQUE, MA, DIAMOND, RM, DUPRAT, J, FALLON, P, FARRIS, LP, HENRY, EA, HUGHES, JR, KELLY, WH, LEE, IY, MACCHIAVELLI, AO, PORQUET, MG, SHARPEYSCHAFER, JF, STEPHENS, FS, STOYER, MA, VO, DT, and WILSON, AN

Abstract

NR 2015

Published
1995
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19. Superdeformation in the Bismuth Nuclei

Author

Clark, R.M., Clark, R.M., Bouneau, S., Azaiez, F., Asztalos, S., Becker, J.A., Cederwall, B., Deleplanque, M.A., Diamond, R.M., Duprat, J., Fallon, P., Farris, L.P., Hughes, J.R., Kelly, W.H., Lee, I.Y., Macchiavelli, A.O., Porquet, M.G., Sharpey-Schafer, J.F., Stephens, F.S., Stoyer, M.A., Vo, D.T., Wilson, A.N., Henry, E.A., Clark, R.M., Clark, R.M., Bouneau, S., Azaiez, F., Asztalos, S., Becker, J.A., Cederwall, B., Deleplanque, M.A., Diamond, R.M., Duprat, J., Fallon, P., Farris, L.P., Hughes, J.R., Kelly, W.H., Lee, I.Y., Macchiavelli, A.O., Porquet, M.G., Sharpey-Schafer, J.F., Stephens, F.S., Stoyer, M.A., Vo, D.T., Wilson, A.N., and Henry, E.A.

Published
1994

20. Superdeformation in the Bismuth Nuclei

Author

Clark, R.M., Clark, R.M., Bouneau, S., Azaiez, F., Asztalos, S., Becker, J.A., Cederwall, B., Deleplanque, M.A., Diamond, R.M., Duprat, J., Fallon, P., Farris, L.P., Hughes, J.R., Kelly, W.H., Lee, I.Y., Macchiavelli, A.O., Porquet, M.G., Sharpey-Schafer, J.F., Stephens, F.S., Stoyer, M.A., Vo, D.T., Wilson, A.N., Henry, E.A., Clark, R.M., Clark, R.M., Bouneau, S., Azaiez, F., Asztalos, S., Becker, J.A., Cederwall, B., Deleplanque, M.A., Diamond, R.M., Duprat, J., Fallon, P., Farris, L.P., Hughes, J.R., Kelly, W.H., Lee, I.Y., Macchiavelli, A.O., Porquet, M.G., Sharpey-Schafer, J.F., Stephens, F.S., Stoyer, M.A., Vo, D.T., Wilson, A.N., and Henry, E.A.

Published
1994

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